refactor: Centralize ad-related error suppression in Sentry

[sentry]

Fixes TANSTACK-COM-1PG. The issue was that: GamScripts' window.onerror handler overwrites Sentry's, preventing proper error delegation and suppression of ad script failures.

• Moved ad-related error suppression logic from a global window.onerror handler in Gam.tsx to Sentry's beforeSend function in router.tsx.
• The beforeSend function now filters out errors originating from specific ad scripts (e.g., fuse.js, nobid/blocking_script.js) and containing common ad-related error messages.
• Removes the custom window.onerror override, streamlining error handling.
• Ensures ad-related errors are filtered at the Sentry ingestion level, preventing them from cluttering error reports.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 9378516

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